Performance testing device for non-automatic weighing apparatus

Abstract

The invention relates to a non-automatic weighing apparatus performance testing device, and belongs to the weighing apparatus detection field, the non-automatic weighing apparatus performance testing device comprises a rack, the rack is provided with a placing table and a weight adding mechanism, the placing table is used for placing a scale body, the rack is provided with a position adjusting mechanism, and the position adjusting mechanism is used for enabling the placing table to make two-dimensional movement in the horizontal direction; the weight adding mechanism comprises a first weight adding assembly, a second weight adding assembly and a third weight adding assembly, the weights comprise a plurality of inner ring weights, a plurality of outer ring weights and a plurality of sensing weights which do not interfere with one another, the first weight adding assembly is used for hoisting the inner ring weights, the second weight adding assembly is used for hoisting the outer ring weights, and the third weight adding assembly is used for hoisting the sensing weights; a receding hole is coaxially formed in the middle of the outer ring weight, and the inner ring weight penetrates through the receding hole. According to the invention, automatic weight adding detection is carried out on the to-be-detected scale body, the detection efficiency and safety of the non-automatic weighing apparatus are improved, and intelligent development of the weighing apparatus inspection and detection industry is supported.

Description

Technical Field

[0001] The present application relates to the field of weighing instrument detection, and in particular to a non-automatic weighing instrument performance testing device. Background Art

[0002] The test results of non-automatic weighing instruments, especially the type evaluation test results, have become an important basis for whether a product can enter the market. Therefore, the performance of non-automatic weighing instruments plays an important supporting role in the quality of electronic scale products.

[0003] In the relevant testing process of non-automatic weighing instruments, it is necessary to successively take and place weights of various specifications at different points of the scale body according to the relevant requirements of the test items, and load sensitive weights of corresponding grades and specifications to determine the metrological performance of the scale body. However, due to the interference between the values ​​of weights, especially sensitive weights, in the conventional mechanical loading process, most institutions or manufacturers use manual or semi-manual operation to perform testing.

[0004] With the improvement of automation and information level, this manual or semi-manual detection method has seriously restricted the development of automation of non-automatic weighing instrument detection, especially for non-automatic weighing instruments with a large range. The detection items require a large number or a large mass of weights, which is labor-intensive and has a great impact on the test environment (such as entering and exiting environmental test chambers at high and low temperatures). This can easily lead to problems such as reduced operating efficiency, reduced operating safety, and poor reproducibility during manual operation. Summary of the invention

[0005] In order to improve the above problems, the present application provides a non-automatic weighing instrument performance testing device.

[0006] The present application provides a non-automatic weighing instrument performance testing device that adopts the following technical solution: A non-automatic weighing instrument performance testing device comprises a frame, wherein the frame is provided with a placing platform and a weight adding mechanism, wherein the placing platform is for placing a weighing body, and the frame is provided with a position adjusting mechanism, wherein the position adjusting mechanism is used to make the placing platform move two-dimensionally in a horizontal direction, wherein the weight adding mechanism comprises a first weight adding component, a second weight adding component and a third weight adding component, wherein the weights comprise a plurality of inner ring weights, a plurality of outer ring weights and a plurality of inductive weights, wherein the first weight adding component is used for lifting the inner ring weights, the second weight adding component is used for lifting the outer ring weights, and the third weight adding component is used for lifting the inductive weights, wherein a clearance hole is coaxially opened in the middle of the outer ring weights, wherein the clearance hole is used for the inner ring weights to pass through.

[0007] By adopting the above technical solution, the position adjustment mechanism is used to adjust the position of the scale body relative to the weight adding mechanism. The weight adding mechanism lowers the weights onto the scale body for testing according to the weight requirement. The operations of taking and positioning the weights are all performed by automated equipment, which improves operational efficiency and accuracy.

[0008] Preferably, a hole wall of the give-way hole is provided with a give-way groove, and the give-way groove is for the inductive weight to pass through.

[0009] Preferably, the position adjustment mechanism includes a transverse screw, a relay frame and a longitudinal screw, the transverse screw is rotatably connected to the frame, the relay frame and the transverse screw are threadedly connected, the longitudinal screw and the relay frame are rotatably connected, the placement table and the longitudinal screw are threadedly connected, and the axes of the transverse screw and the longitudinal screw are both horizontal and perpendicular to each other.

[0010] By adopting the above technical solution, the directional movement of the relay frame and the placement table is controlled by screw transmission, and the movement directions of the two are perpendicular to each other, so the placement table can be moved to any position in the horizontal direction.

[0011] Preferably, multiple inner ring weights or multiple outer ring weights are stacked vertically, and suspension holes are vertically opened on the inner ring weights and the outer ring weights, and the hole wall of the upper hole opening of the suspension hole is provided with a suspension chamfer. Suspension pins are fixedly provided on the inner ring weights and the upper side of the outer ring weights, and a suspension wedge is fixedly provided on the upper end of the suspension pin. The suspension hole of the upper weight is for the suspension pin of the lower weight to pass through, and when the wedge surface of the suspension wedge contacts the suspension chamfer, there is a gap between two adjacent weights, the first weighting component is connected to the uppermost inner ring weight, and the second weighting component is connected to the uppermost outer ring weight.

[0012] By adopting the above technical solution, under the control of the weight adding mechanism, a vertical row of inner circle weights or outer circle weights moves downward, and after the weights on the lower side touch the placement table or touch the weights on the lower side, no downward pulling force is generated on the weights on the upper side, and the weights on the upper side do not generate an upward pulling force on the weights on the lower side, thereby changing the amount of weights placed on the placement table.

[0013] Preferably, a force-bearing body is fixedly connected to the upper side of the sensitive weight, a space slot is opened on the lower side of the sensitive weight, several sensitive weights are stacked vertically, two adjacent sensitive weights abut against each other, and the force-bearing body of the lower sensitive weight is located in the space slot of the upper sensitive weight.

[0014] By adopting the above technical solution, the sensitive weights can also be stacked up one by one, and the force-bearing body is used for suspending and applying force to the third weight-adding assembly. When the weights are stacked, the space groove of the upper weight provides space for the force-bearing body of the lower weight.

[0015] Preferably, the third weighting component includes a third slider, a vertical suspension rod, a locking piece and a control component. The third slider moves vertically relative to the frame. One end of the vertical suspension rod is connected to the third slider, and the other end is connected to the inductive weight through a locking piece. There are two locking pieces and the locking pieces are movably connected relative to the vertical suspension rod. The control component is used to control the movement of the locking pieces, and the two locking pieces abut against the opposite side walls of the force-bearing body.

[0016] Preferably, the force-bearing body includes a thick head and a thin neck, and the thin neck is located between the thick head and the inductive weight. The retaining piece is made of elastic material, and the two retaining pieces are rotatably connected to the hanging rod, and the rotation axis is in the horizontal direction. The control component is used to control the two retaining components to rotate synchronously in opposite directions. The retaining piece is provided with a matching groove, and when the two retaining pieces abut against each other, the two matching grooves are assembled into a through hole for the thin neck to pass through.

[0017] By adopting the above technical solution, the two clamping members form a clamp to relatively clamp the force-bearing body, thereby realizing the suspension connection of the vertical suspension rod to the sensitive weight.

[0018] Preferably, an air pressure channel is opened in the hanging rod, and the control component includes a control piston and a control gear. The control piston is slidably arranged in the air pressure channel, and the sliding direction is vertical. A control rack is fixedly connected to the control piston. The control gear and the rotating shaft of the locking member are coaxially fixedly connected, and the control rack transmits torque to the control gear.

[0019] By adopting the above technical solution, the movement of the control piston is driven by the change of air pressure, and then the rotation of the locking member is controlled by the thread pair, so that the locking member performs its own function.

[0020] Preferably, an auxiliary rod is slidably provided on the hanging rod, the sliding direction of the auxiliary rod is vertical, one end of the auxiliary rod abuts against one end of the thick head away from the sensitive weight, and the auxiliary rod is made of elastic material.

[0021] Preferably, one end of the auxiliary rod away from the thick head passes through the control piston and is inserted into the air pressure channel, and a reset spring is connected between the auxiliary rod and the control piston.

[0022] By adopting the above technical solution, under the action of air pressure, the auxiliary rod can move closer to or away from the force-bearing body. When the clamping piece clamps the force-bearing body, the auxiliary rod abuts against the upper side of the force-bearing body. The two together form a multi-directional abutment reinforcement for the force-bearing body, thereby improving the relative stability of the sensitive weight during the falling process.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the setting of the position adjustment mechanism and the weight adding mechanism, the position adjustment mechanism is used to adjust the position of the scale body relative to the weight adding mechanism. The weight adding mechanism lowers the weight onto the scale body for testing according to the product implementation standard or the test load requirements of the measurement technical specification test item. The weight taking and positioning operations are all performed by automated equipment. There is no mutual interference force between the weights, which improves the operation efficiency and accuracy; 2. Through the arrangement of the sensitive weights and the third weight-adding component, the third weight-adding component can vertically and gently stack the sensitive weights one by one on the scale body, and perform error determination and identification threshold item detection on the scale body test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a non-automatic weighing instrument performance testing device in Example 1 of the present application.

[0025] Figure 2 It is a schematic cross-sectional view of the structure used to illustrate that two adjacent inner circle weights are connected by a suspension pin in the first embodiment of the present application.

[0026] Figure 3 It is a schematic diagram of the connection structure between the end of the vertical suspension rod and the sensitive weight in the second embodiment of the present application.

[0027] Figure 4 It is a schematic diagram used to embody the discrimination threshold measurement principle in Embodiment 1 or 2 of the present application.

[0028] Description of reference numerals: 1, rack; 11, placement table; 2, position adjustment mechanism; 21, horizontal screw; 22, relay frame; 23, longitudinal screw; 3, weighting mechanism; 31, first weighting assembly; 311, first slider; 32, second weighting assembly; 321, second slider; 33, third weighting assembly; 331, third slider; 332, hanging rod; 3321, air pressure channel; 333, positioning member; 3331, matching groove; 34, Control assembly; 341, control piston; 342, control gear; 343, control rack; 344, auxiliary rod; 345, reset spring; 4, inner ring weight; 41, outer ring weight; 411, make way hole; 412, make way groove; 42, suspension pin; 421, suspension wedge; 43, suspension hole; 431, suspension chamfer; 44, sensitive weight; 441, force-bearing body; 4411, thick head; 4412, thin neck; 442, space groove. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-4 This application is described in further detail.

[0030] Embodiment 1: The present application embodiment discloses a non-automatic weighing instrument performance testing device, such as Figure 1As shown, it includes a frame 1, on which a placing platform 11, a position adjustment mechanism 2 and a weight adding mechanism 3 are provided. The placing platform 11 is for placing the scale body, the position adjustment mechanism 2 is used to make the placing platform 11 move two-dimensionally in the horizontal direction, and the weight adding mechanism 3 is used to place weights on the scale body. There are three types of weights: inner ring weights 4, outer ring weights 41 and sensitive weights 44. The volume and weight of the outer ring weights 41 are both large (30-100kg each), the volume and weight of the inner ring weights 4 are relatively low (3-15kg each), and the volume and weight of the sensitive weights 44 are extremely small (0.5-14g each).

[0031] like Figure 1 As shown, the position adjustment mechanism 2 includes a transverse screw 21, a relay frame 22 and a longitudinal screw 23. The transverse screw 21 is rotatably connected to the frame 1, the relay frame 22 is threadedly connected to the transverse screw 21, the longitudinal screw 23 is rotatably connected to the relay frame 22, the placement table 11 is threadedly connected to the longitudinal screw 23, and the axes of the transverse screw 21 and the longitudinal screw 23 are both horizontal and perpendicular to each other. Motors for controlling the rotation of the transverse screw 21 and the longitudinal screw 23 are respectively provided on the frame 1 and the relay frame 22, so that the placement table 11 can carry the scale body on the frame 1 and move to any position in the horizontal direction.

[0032] like Figure 1 and 2As shown, the weight adding mechanism 3 includes a first weight adding component 31, a second weight adding component 32 and a third weight adding component 33. The first weight adding component 31 is used to lift the inner ring weight 4, the second weight adding component 32 is used to lift the outer ring weight 41, and the third weight adding component 33 is used to lift the inductive weight 44. The first weight adding component 31 includes a motor screw mechanism and a first slider 311, and the second weight adding component 32 includes a motor screw mechanism and a second slider 321. The first slider 311 and the second slider 321 both move vertically relative to the frame 1, and the motor screw mechanism is used to apply movement control power to the first slider 311 or the second slider 321. Multiple inner ring weights 4 or multiple outer ring weights 41 are stacked vertically, and the outer ring weight 41 is disc-shaped, and a clearance hole 411 is coaxially opened in the middle thereof, and the clearance hole 411 is for the inner ring weight 4 to pass through. The inner ring weight 4 and the outer ring weight 41 are both provided with a suspension hole 43 in the vertical direction, and the hole wall of the upper hole of the suspension hole 43 is provided with a suspension chamfer 431. The inner ring weight 4 and the upper side of the outer ring weight 41 are both fixedly provided with a suspension pin 42, and the upper end of the suspension pin 42 is fixedly provided with a suspension wedge 421. The suspension hole 43 of the weight on the upper side is for the suspension pin 42 of the weight on the lower side to pass through. The weights sag naturally under the action of gravity. When the wedge surface of the suspension wedge 421 contacts the suspension chamfer 431, there is a gap between two adjacent weights. The first slider 311 is connected to the uppermost inner ring weight 4, and the second slider 321 of the second weighting assembly 32 has two second sliders 321, which move synchronously. The second slider 321 is connected to the uppermost outer ring weight 41, and the connection point is located at the outer edge of the outer ring weight 41.

[0033] like Figure 1 As shown, the third weighting assembly 33 includes a motor screw mechanism, a third slider 331 and a hanging rod 332. The motor screw mechanism controls the third slider 331 to move vertically relative to the frame 1. The length direction of the hanging rod 332 is the vertical direction. Its upper end is connected to the third slider 331, and its lower end is connected to a single inductive weight 44 through a hook (not shown in the figure). In this embodiment, there are two third weighting assemblies 33, and there are also two give-way slots 412.

[0034] Embodiment 2: like Figure 3As shown, the difference from the first embodiment is that a force-bearing body 441 is fixedly connected to the upper side of the sensing weight 44. A space slot 442 is provided on the lower side of the sensing weight 44. When a plurality of sensing weights 44 are stacked vertically, two adjacent sensing weights 44 abut against each other, and the force-bearing body 441 of the lower sensing weight 44 is located in the space slot 442 of the upper sensing weight 44. A clearance slot 412 is provided on the hole wall of the clearance hole 411. The force-bearing body 441 of the sensing weight 44 includes a thick head 4411 and a thin neck 4412, and the thin neck 4412 is located between the thick head 4411 and the sensing weight 44. The third weighting component 33 also includes a clamping piece 333 and a control component 34. The hanging rod 332 is a hard rod, and its upper end is fixedly connected to the third slider 331. There are two clamping pieces 333, and the clamping pieces 333 are movably connected to the hanging rod 332. The control component 34 is used to control the movement of the clamping piece 333. The clamping piece 333 is made of elastic material, and the two clamping pieces 333 will respectively abut on the opposite sides of the force-bearing body 441. Both the two clamping pieces 333 are rotatably connected to the hanging rod 332, and the rotation axis is in the horizontal direction. The control component 34 is used to control the two clamping components to rotate synchronously in the opposite direction. The clamping piece 333 is provided with a matching groove 3331. When the two clamping pieces 333 abut against each other, the two matching grooves 3331 are assembled into a through hole for the thin neck 4412 to pass through, and the opening of this through hole is smaller than the width of the thick head 4411.

[0035] like Figure 3 As shown, the control assembly 34 includes a control piston 341 and a control gear 342. A pneumatic channel 3321 is provided in the hanging rod 332 along its length. A small air pump (not shown in the figure) is provided on the third slider 331 for inputting or sucking gas into the pneumatic channel 3321. The control piston 341 is slidably arranged in the pneumatic channel 3321, and the sliding direction is vertical. A control rack 343 is fixedly connected to the control piston 341. The control gear 342 is rotatably connected to the hanging rod 332. There are two control gears 342 between the control piston 341 and a positioning member 333. The two control gears 342 are meshed with each other. One of the control gears 342 is coaxially fixedly connected to the rotating axis of the positioning member 333, and the other control gear 342 is meshed with the control rack 343. Therefore, when the control piston 341 moves downward, the two positioning members 333 will swing close to each other, thereby clamping the force-bearing member.

[0036] like Figure 3As shown, an auxiliary rod 344 is slidably provided on the hanging rod 332, and the sliding direction is the vertical direction. The end of the auxiliary rod 344 away from the thick head 4411 passes through the control piston 341 and is inserted into the air pressure channel 3321. A reset spring 345 is connected between the auxiliary rod 344 and the control piston 341. In a natural state, even if the control piston 341 slides to the position where the two positioning members 333 abut against the force receiving member, the end of the auxiliary rod 344 facing the sensitive weight 44 does not touch the thick head 4411, and When high-pressure gas rushes into the air pressure channel 3321, the control piston 341 moves toward the sensitive weight 44, and the auxiliary rod 344 also moves relative to the control piston 341, the reset spring 345 is compressed, and the auxiliary rod 344 finally abuts against the end of the thick head 4411 away from the sensitive weight 44. As a result, the force-bearing part is subjected to a vertical downward abutting force, so that the auxiliary rod 344 and the positioning member 333 jointly form a tight abutment on the force-bearing part from multiple directions to reduce the shaking of the sensitive weight 44 when the sensitive weight 44 is hoisted.

[0037] like Figure 3 As shown, in the process of lowering the sensitive weight 44, when the sensitive weight 44 at the lower end of the suspension rod is close to the surface of the scale to be measured or the sensitive weight 44 placed below, the air pressure in the air pressure channel 3321 is reduced, and the auxiliary rod 344 is reset first and leaves the force-bearing body 441; but at this time, the control piston 341 has not moved, and the two retaining members 333 have not separated; the air pressure is further reduced, and the control piston 341 moves the two retaining members 333 to swing in the opposite direction and separate, and the sensitive weight 44 slowly slides down, and falls to the scale to be measured below or the sensitive weight 44 below before the retaining member 333 separates from the rough head 4411, completing the stacking placement of a single sensitive weight 44.

[0038] A non-automatic weighing instrument performance testing device according to an embodiment of the present application can perform the following items or parameter tests on a non-automatic weighing instrument: 1. Weighing: Gradually add weights from zero to the maximum weighing capacity, and then gradually remove the weights to zero in the same reverse order. During the test, it should be noted that when adding or removing weights, they should be gradually increased or decreased. When the weights are loaded or unloaded to the specified measuring point, the sensitive weights are automatically loaded to determine the indication error of the scale at that measuring point.

[0039] 2. Repeatability: A set of tests is carried out with a weight of about 50% of the maximum weighing capacity. The scale to be tested is weighed three times. The readings are taken after each loading and unloading when the indication reaches static stability. Each time, the sensitive weight is automatically loaded to determine the indication error of the scale at that measuring point.

[0040] 3. Eccentric loading: The weight applied to the scale to be measured is equivalent to 1 / (n-1) of the maximum weighing capacity, where n is the number of supporting points. The weight is applied on each supporting point in turn, and the area occupied is about 1 / n of the scale surface. When the weight is loaded to the predetermined measuring point, the sensitive weight is automatically loaded to determine the indication error of the scale at the measuring point.

[0041] 4. Tare weighing: Select a tare value between 1 / 3 and 2 / 3 of the maximum tare weight to tare the scale, then gradually add weights to the maximum weighing capacity after tare, and unload the weights to zero in the same reverse order. When the weights are loaded or unloaded to the specified measuring point, the sensitive weights are automatically loaded to determine the indication error of the scale at that measuring point.

[0042] 5. Identification threshold: Figure 4 As shown, the calibration is performed under three different loads, Min, Max / 2 and Max. A certain load and sufficient additional inductive weights (e.g., 10 inductive weights of 0.1d) are placed on the scale to be tested. Then the additional inductive weights are removed one by one until the indicated value I is clearly reduced by one actual scale value and becomes Id. Put a sensitive weight back on the scale to be tested, and then gently place a weight equivalent to 1.4d on the scale to be tested. The result is an increase of one actual scale value on the original indicated value, i.e., 1 + d.

[0043] 6. Warm-up time experiment: Turn on the scale to be tested after it has been powered off for at least 8 hours, and immediately reset the scale to zero after the indication stabilizes, and automatically load the weight and the inductive weight to determine the zero-point error. Then load the maximum weight and the inductive weight to determine the point error. Repeat the test after 5, 15, and 30 minutes.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A non-automatic weighing instrument performance testing device, comprising a frame (1), the frame (1) being provided with a placement table (11) and a weight adding mechanism (3), the placement table (11) being provided for placing a weighing body, characterized in that: The frame (1) is provided with a position adjustment mechanism (2), and the position adjustment mechanism (2) is used to make the placement platform (11) move two-dimensionally in the horizontal direction. The weight adding mechanism (3) comprises a first weight adding component (31), a second weight adding component (32) and a third weight adding component (33). The weights comprise a plurality of inner ring weights (4), a plurality of outer ring weights (41) and a plurality of inductive weights (44). The first weight adding component (31) is used to lift the inner ring weights (4), the second weight adding component (32) is used to lift the outer ring weights (41), and the third weight adding component (33) is used to lift the inductive weights (44). A clearance hole (411) is coaxially opened in the middle of the outer ring weight (41), and the clearance hole (411) is used for the inner ring weights (4) to pass through.

2. A non-automatic weighing instrument performance testing device according to claim 1, characterized in that: A clearance groove (412) is provided on the hole wall of the clearance hole (411), and the clearance groove (412) is used for the inductive weight (44) to pass through.

3. A non-automatic weighing instrument performance testing device according to claim 1 or 2, characterized in that: The position adjustment mechanism (2) comprises a transverse screw (21), a relay frame (22) and a longitudinal screw (23); the transverse screw (21) is rotatably connected to the frame (1); the relay frame (22) is threadedly connected to the transverse screw (21); the longitudinal screw (23) is rotatably connected to the relay frame (22); the placement platform (11) is threadedly connected to the longitudinal screw (23); and the axes of the transverse screw (21) and the longitudinal screw (23) are both horizontal and perpendicular to each other.

4. A non-automatic weighing instrument performance testing device according to claim 1 or 2, characterized in that: A plurality of the inner ring weights (4) or a plurality of the outer ring weights (41) are stacked vertically, and a suspension hole (43) is vertically opened on the inner ring weight (4) and the outer ring weight (41), and a suspension chamfer (431) is arranged on the hole wall of the upper hole opening of the suspension hole (43). A suspension pin (42) is fixedly arranged on the upper side of the inner ring weight (4) and the outer ring weight (41), and a suspension wedge (421) is fixedly arranged on the upper end of the suspension pin (42). The suspension hole (43) of the upper weight is for the suspension pin (42) of the lower weight to pass through, and when the wedge surface of the suspension wedge (421) contacts the suspension chamfer (431), there is a gap between two adjacent weights, and the first weight adding component (31) is connected to the uppermost inner ring weight (4), and the second weight adding component (32) is connected to the uppermost outer ring weight (41).

5. A non-automatic weighing instrument performance testing device according to claim 1 or 2, characterized in that: The upper side of the sensing weight (44) is fixedly connected with a force-bearing body (441), and the lower side of the sensing weight (44) is provided with a space groove (442). A plurality of sensing weights (44) are stacked vertically, and two adjacent sensing weights (44) abut against each other, and the force-bearing body (441) of the lower sensing weight (44) is located in the space groove (442) of the upper sensing weight (44).

6. A non-automatic weighing instrument performance testing device according to claim 5, characterized in that: The third weighting component (33) comprises a third slider (331), a hanging rod (332), a locking piece (333) and a control component (34); the third slider (331) moves vertically relative to the frame (1); one end of the hanging rod (332) is connected to the third slider (331), and the other end is connected to the inductive weight (44) through the locking piece (333); there are two locking pieces (333) and the locking pieces (333) are movably connected relative to the hanging rod (332); the control component (34) is used to control the movement of the locking pieces (333); the two locking pieces (333) abut against opposite side walls of the force-receiving body (441).

7. A non-automatic weighing instrument performance testing device according to claim 6, characterized in that: The force-bearing body (441) comprises a thick head (4411) and a thin neck (4412), wherein the thin neck (4412) is located between the thick head (4411) and the inductive weight (44), the positioning member (333) is made of elastic material, the two positioning members (333) are both rotatably connected to the hanging rod (332), and the rotation axis is in the horizontal direction, the control component (34) is used to control the two positioning components to rotate synchronously in opposite directions, and the positioning member (333) is provided with a matching groove (3331), and when the two positioning members (333) are in contact with each other, the two matching grooves (3331) are assembled into a through hole for the thin neck (4412) to pass through.

8. A non-automatic weighing instrument performance testing device according to claim 7, characterized in that: An air pressure channel (3321) is provided in the hanging rod (332), and the control assembly (34) includes a control piston (341) and a control gear (342). The control piston (341) is slidably arranged in the air pressure channel (3321), and the sliding direction is vertical. A control rack (343) is fixedly connected to the control piston (341), and the rotating shafts of the control gear (342) and the locking member (333) are coaxially fixedly connected, and the control rack (343) transmits torque to the control gear (342).

9. A non-automatic weighing instrument performance testing device according to claim 8, characterized in that: An auxiliary rod (344) is slidably arranged on the hanging rod (332), and the sliding direction is the vertical direction. One end of the auxiliary rod (344) abuts against one end of the thick head (4411) away from the sensitive weight (44), and the auxiliary rod (344) is made of elastic material.

10. A non-automatic weighing instrument performance testing device according to claim 9, characterized in that: One end of the auxiliary rod (344) away from the thick head (4411) passes through the control piston (341) and is inserted into the air pressure channel (3321), and a reset spring (345) is connected between the auxiliary rod (344) and the control piston (341).

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